CN110830178A - HARQ-ACK information feedback method, user terminal and computer readable storage medium - Google Patents
HARQ-ACK information feedback method, user terminal and computer readable storage medium Download PDFInfo
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- CN110830178A CN110830178A CN201810913867.4A CN201810913867A CN110830178A CN 110830178 A CN110830178 A CN 110830178A CN 201810913867 A CN201810913867 A CN 201810913867A CN 110830178 A CN110830178 A CN 110830178A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
- H04L1/1678—Details of the supervisory signal the supervisory signal being transmitted together with control information where the control information is for timing, e.g. time stamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
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Abstract
A feedback method of HARQ-ACK information, a user terminal and a computer readable storage medium are provided. The method comprises the following steps: reading values of a count DAI and a total DAI from a Downlink Assignment Index (DAI) field of DCI when DCI is received; determining the length of an HARQ-ACK codebook based on the value of the total DAI corresponding to the last DAI counting time in the physical downlink control channel monitoring time set; feeding back HARQ-ACK information corresponding to the physical downlink control channel monitoring time set to a base station based on the determined HARQ-ACK codebook length; when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the values of the counting DAI and the total DAI are obtained by counting the number of times that the base station sends the DCI by using the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time. By applying the scheme, the length of the HARQ-ACK codebook can be accurately determined.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a feedback method of HARQ-ACK information, a user terminal and a computer readable storage medium.
Background
Hybrid Automatic Repeat ReQuest (HARQ) is a technology combining Forward Error Correction (FEC) and Automatic Repeat ReQuest (ARQ) methods.
In the actual communication process, for both communication parties supporting the HARQ mechanism, the receiving end will use the error detection code to detect whether the received data packet is erroneous. If the received data packet is error-free, the receiving end will feed back a positive Acknowledgement (ACK) message to the transmitting end. After receiving the ACK message, the transmitting end will then transmit the next data packet. If the received data packet is erroneous, the receiving end discards the data packet and feeds back a Negative Acknowledgement (NACK) message to the transmitting end. After receiving the NACK message, the transmitting end retransmits the same data. The ACK information and the NACK information are collectively referred to as HARQ-ACK information.
Under the condition of adopting the dynamic HARQ-ACK codebook, a User Equipment (UE) serving as a receiving end determines the bit number of the fed-back HARQ-ACK Information, that is, the length of the HARQ-ACK codebook, by counting Downlink Control Information (DCI) sent by a base station to a serving cell, and further compresses the HARQ-ACK Information according to the determined codebook length to generate and feed back a corresponding HARQ-ACK codebook.
In a New Radio access technology (NR) system of a fifth generation mobile communication technology (5G), when a UE detects DCI transmitted by a base station, a missed detection condition often occurs, which results in a low accuracy of a determined HARQ-ACK codebook length and finally affects resource selection of a Physical Uplink Control Channel (PUCCH).
Disclosure of Invention
The problem to be solved by the invention is how to more accurately determine the length of the HARQ-ACK codebook.
In order to solve the above problem, an embodiment of the present invention provides a method for feeding back HARQ-ACK information, where the method includes: for a time slot for feeding back HARQ-ACK information configured in advance, in a physical downlink control channel monitoring time set associated with a HARQ feedback window corresponding to the time slot for sending the HARQ-ACK information, when DCI is received, reading values of a counting DAI and a total DAI from a downlink assignment index DAI field of the DCI; determining the length of an HARQ-ACK codebook based on the value of the total DAI corresponding to the last DAI counting time in the physical downlink control channel monitoring time set; feeding back HARQ-ACK information corresponding to the physical downlink control channel monitoring time set to a base station based on the determined HARQ-ACK codebook length; when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time; and when the monitoring time of the physical downlink control channel is not located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time.
Optionally, the total DAI is: and the total amount of DCI sent by the base station in all cells from the first DAI counting time to the current DAI counting time in the physical downlink control channel monitoring time set.
Optionally, the count DAI is: and in the physical downlink control channel monitoring time set, the base station sends the cumulative count of DCI times from the first cell to the current cell at the current DAI counting time and the sum of the total DAI corresponding to the previous DAI counting time.
Optionally, the determining the length of the HARQ-ACK codebook based on the value of the total DAI corresponding to the last DAI counting time in the set of the listening time of the physical downlink control channel includes: determining the actual total DAI value corresponding to the last DAI counting moment based on the number of times that the DCI is actually received and the total DAI value read from the DCI at the last DAI counting moment; and determining the length of the HARQ-ACK codebook based on the value of the actual total DAI corresponding to the last DAI counting moment.
Optionally, the method further comprises: and judging whether the DCI is missed to be detected or not based on the actual counting DAI and the total DAI value.
Optionally, the HARQ feedback window is determined by a set of HARQ-ACK feedback times.
Optionally, the set of monitoring time of the physical downlink control channel is: and the time slot in the HARQ feedback window receives a set of physical downlink control channel monitoring time corresponding to the PDSCH data.
An embodiment of the present invention further provides a user terminal, where the user terminal includes: a reading unit, adapted to, for a pre-configured time slot for feeding back HARQ-ACK information, read, when receiving DCI, values of a count DAI and a total DAI from a downlink assignment index DAI field of the DCI in a monitoring time set of a physical downlink control channel associated with a HARQ feedback window corresponding to the time slot for sending the HARQ-ACK information; a codebook length determining unit, adapted to determine the HARQ-ACK codebook length based on the value of the total DAI corresponding to the last DAI counting time in the set of physical downlink control channel monitoring times; a feedback unit, adapted to feed back HARQ-ACK information corresponding to the physical downlink control channel monitoring time set to a base station based on the determined HARQ-ACK codebook length; when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time; and when the monitoring time of the physical downlink control channel is not located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time.
Optionally, the total DAI is: and the total amount of DCI sent by the base station in all cells from the first DAI counting time to the current DAI counting time in the physical downlink control channel monitoring time set.
Optionally, the count DAI is: and in the physical downlink control channel monitoring time set, the base station sends the cumulative count of DCI times from the first cell to the current cell at the current DAI counting time and the sum of the total DAI corresponding to the previous DAI counting time.
Optionally, the codebook length determining unit includes: the first determining subunit is suitable for determining an actual total DAI value corresponding to the last DAI counting moment based on the number of times that the DCI is actually received and the total DAI value read from the DCI at the last DAI counting moment; and the second determining subunit is suitable for determining the length of the HARQ-ACK codebook based on the value of the actual total DAI corresponding to the last DAI counting moment.
Optionally, the user terminal further includes: and the judging unit is suitable for judging whether the DCI is missed to be detected or not based on the actual counting DAI and the total DAI.
Optionally, the HARQ feedback window is determined by a set of HARQ-ACK feedback times.
Optionally, the set of monitoring time of the physical downlink control channel is: and the time slot in the HARQ feedback window receives a set of physical downlink control channel monitoring time corresponding to the PDSCH data.
Embodiments of the present invention further provide a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method of any one of the above-mentioned steps is performed.
The embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores computer instructions capable of running on the processor, and the processor executes any of the steps of the method when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
by adopting the scheme, when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the initial position of the time slot where the physical downlink control channel monitoring time is located is used as the DAI counting time, the number of DCI (downlink control information) sent by the base station in the physical downlink control channel monitoring time set is counted, and then the values of the counted DAI and the total DAI in the DCI can be obtained based on the counting result, so that DCI scheduled at different physical downlink control channel monitoring times can be counted at the same counting time. Compared with the detection of DCI by taking the monitoring time of the physical downlink control channel as the counting time, when the UE detects the DCI at the starting position of the time slot where the monitoring time of the physical downlink control channel is located, the number of the DCI existing at the same time is more, so that the situation that only one DCI exists at the last DAI counting time can be reduced, the missed detection of the DCI can be effectively avoided, the HARQ-ACK codebook length can be accurately determined based on the counting DAI corresponding to the last DAI counting time and the total DAI value, and the resource selection of the PUCCH is prevented from being influenced.
Drawings
Fig. 1 is a schematic configuration diagram of a physical downlink control channel monitoring time in an embodiment of the present invention;
fig. 2 is a flowchart of a method for feeding back HARQ-ACK information according to an embodiment of the present invention;
fig. 3 is a schematic configuration diagram of another time for monitoring a physical downlink control channel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a user terminal in an embodiment of the present invention.
Detailed Description
In the 5G NR system, a Downlink Assignment Index (DAI) field is configured in DCI, and the DAI field includes values of a count DAI (counter DAI) and a total DAI (total DAI). And counting the DAI and the total DAI by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time and counting the DCI times sent by the base station no matter whether the monitoring time of the physical downlink control channel is positioned at the first three OFDM symbols of the time slot.
In the 5G NR, different Subcarrier Spacing (SCS) can be configured for a fractional Bandwidth (BWP). For the same SCS, the position of the starting symbol of the listening time of the physical downlink control channel can be configured differently. This flexibility results in a reduced probability of multiple DCI being present at the same time at a certain pdcch listening time. If there is only one DCI at the last pdcch monitoring time and the DCI is missed, the UE cannot recognize the missed detection of the DCI, which affects the HARQ-ACK codebook length and further affects the PUCCH resource selection.
The following examples illustrate:
referring to fig. 1, the monitoring time of the physical downlink control channel of the cell 0 is an OFDM symbol 0 of each time slot, the monitoring time of the physical downlink control channel of the cell 1 is an OFDM symbol 1 of each time slot, and the monitoring time of the physical downlink control channel of the cell 2 is an OFDM symbol 2 of each time slot.
For a certain time slot n, the count DAI (i.e., C-DAI) and the total DAI (i.e., T-DAI) read by the UE in DCI are shown in table 1, assuming that the UE only feeds back for the time slot n. In time slot n, when the UE performs blind detection, only the DCI on cell 0 and cell 1 are solved, and the DCI on cell 2 is not solved. At this time, the UE determines the codebook length, i.e. 2 DCIs, according to the total DAI received at the last pdcch listening time (i.e. time 2). However, the number of times of actually sending DCI in the set of the physical downlink control channel listening time corresponding to the time slot n by the base station is 3 DCI, and the codebook length is determined according to 2 DCI, which is obviously inaccurate.
TABLE 1
In view of the above problems, embodiments of the present invention provide a method for feeding back HARQ-ACK information, which applies this scheme, when the monitoring time of the physical downlink control channel is located in the first three OFDM symbols of the time slot, the initial position of the time slot where the monitoring time of the physical downlink control channel is located is used as the DAI counting time, counting the number of DCI transmission times of the base station in the physical downlink control channel monitoring time set, and then the counting DAI and the total DAI value in the DCI can be obtained based on the counting result, thereby enabling the DCI scheduled at different physical downlink control channel monitoring time to count at the same counting time, and further, at any DAI counting time, the number of DCI existing at the same time is more, so that the situation that only one DCI exists at the last DAI counting time can be reduced, the DCI is effectively prevented from being missed to be detected, and the accuracy of the determined HARQ-ACK codebook length is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 2, an embodiment of the present invention provides a method for feeding back HARQ-ACK information, where the method may include the following steps:
and step 21, for the time slot for feeding back the HARQ-ACK information configured in advance, in the monitoring time set of the physical downlink control channel associated with the HARQ feedback window corresponding to the time slot for sending the HARQ-ACK information, when receiving DCI, reading the values of the counting DAI and the total DAI from the downlink assignment index DAI field of the DCI.
When the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time;
when the monitoring time of the physical downlink control channel is not located in the first three OFDM symbols of the time slot, the values of the counting DAI and the total DAI are obtained by counting the DCI sending times of the base station by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time
In specific implementation, the base station sends the indication information of the time slot for feeding back the HARQ-ACK information to the UE in advance, and based on the indication information, the UE can know in which time slot to feed back the HARQ-ACK information. Meanwhile, based on the time slot for feeding back the HARQ-ACK information, the UE can determine a HARQ feedback window, and further determine a physical downlink control channel monitoring time set associated with the HARQ feedback window based on the HARQ feedback window. The HARQ feedback window may include only one slot, or may include multiple slots, which is not limited in this embodiment.
In a specific implementation, the HARQ feedback window is determined by a set of HARQ-ACK feedback times. The HARQ-ACK feedback time, i.e., a time interval from receiving data of a Physical Downlink Shared Channel (PDSCH) to receiving DCI, may be represented by K0. In general, K0 may be obtained from a time domain resource allocation table (PDSCH-timedomainresource allocation) configured by higher layer signaling.
In a specific implementation, the set of monitoring time of the physical downlink control channel is as follows: and the time slot in the HARQ feedback window receives a set of physical downlink control channel monitoring time corresponding to the data of the PDSCH, namely a set of time intervals between the HARQ-ACK feedback time slot and the PDSCH data receiving. Wherein, the time interval between the HARQ-ACK feedback slot and the receiving of the PDSCH data may be denoted by K1. In general, K1 may be configured by higher layer signaling.
For example, the base station may instruct the UE to feed back HARQ-ACK information in slot n, and the base station configures a set of K1 on a certain active Bandwidth Part (BWP) through higher layer signaling to be {1, 2, 3, 4, 5, 6, 7, 8}, and then the corresponding HARQ feedback window is: slot n-8 to slot n-1. Meanwhile, the UE may obtain the set of K0 on the activated BWP as {0} from the time domain resource configuration table configured by the high layer signaling, and the base station configures the UE to monitor the PDCCH in the OFDM symbol 0 of each timeslot through the high layer signaling, so that the set of the monitoring time of the physical downlink control channel associated with the HARQ feedback window of the timeslot n on the activated BWP is: slot n-8 through OFDM symbol 0 of each of slots n-1. If the UE feeds back HARQ-ACK information of multiple cells in time slot n, the set of the monitoring time of the physical downlink control channel associated with the HARQ feedback window of time slot n is: and the union set of the sets of the physical downlink control channel listening time instants associated with the HARQ feedback window of the time slot n on the active BWP of each cell.
It can be understood that, in practical applications, for a UE, no matter a HARQ feedback window, or a set of listening time of a physical downlink control channel associated with the HARQ feedback window, before performing the steps of the feedback method for HARQ-ACK information in the embodiment of the present invention, the method can be obtained.
And in the physical downlink control channel monitoring time set, a plurality of base stations transmit DCI to the UE. Each base station may correspond to a serving cell. Accordingly, the number of serving cells may be only one or may be plural.
In specific implementation, the base station may send, to the UE, indication information of the physical downlink control channel monitoring time in advance, and the UE may obtain the specific physical downlink control channel monitoring time based on the indication information. It can be understood that only one monitoring time of the physical downlink control channel may be configured in one timeslot, or multiple monitoring times of the physical downlink control channel may be configured.
In an embodiment of the present invention, each of the monitoring times of the pdcch configured by the base station may be located in the first three OFDM symbols of the time slot where the pdcch is located. At this time, the starting position of the time slot where each physical downlink control channel monitoring time is located is the DAI counting time.
In another embodiment of the present invention, part or all of the listening time of the physical downlink control channel configured by the base station may not be located in the first three OFDM symbols of the located time slot, for example, the listening time of the physical downlink control channel may be located in other OFDM symbols except for the first three OFDM symbols, and the other OFDM symbols may be continuous OFDM symbols or discontinuous OFDM symbols.
And step 22, determining the length of the HARQ-ACK codebook based on the value of the total DAI corresponding to the last DAI counting time in the physical downlink control channel monitoring time set.
In an implementation, to reduce the number of bits occupied by the DAI field in DCI, the base station typically uses a limited number of bits to indicate the value of the count DAI and the total DAI in the DAI field. At this time, after reading the counted DAI and the total DAI value, the UE generally needs to determine the actual total DAI value corresponding to the last DAI counting time based on the number of times the DCI has been actually received and the total DAI value read from the DCI at the last DAI counting time, and then determine the HARQ-ACK codebook length based on the actual total DAI value corresponding to the last DAI counting time.
Taking the example that the base station uses 2 bits to indicate the value C-DAI of the count DAI in the DAI field, referring to table 2, the value of the count DAI read by the UE from the DCI includes: 00, 01, 10 and 11, respectively, representing the value of the count DAI
1, 2, 3 and 4. The value of the actual count DAI is noted as Y,y and
the corresponding relation between the two is (Y-1)
TABLE 2
After reading the value C-DAI of the counting DAI, the UE may first determine the value of the counting DAI according to the corresponding relationship shown in Table 2
Further according to Y and
the correspondence between the two and the number of times that the DCI has been actually received is based on, the value of Y, that is, the value of the actual count DAI is obtained.
In an embodiment of the present invention, the method may further include: and judging whether the DCI is missed to be detected or not based on the actual counting DAI and the total DAI value.
Specifically, when the value of the actual count DAI is not consistent with the value of the actual total DAI, it may be determined that the UE fails to detect the DCI.
And step 23, feeding back HARQ-ACK information corresponding to the physical downlink control channel monitoring time set to the base station based on the determined HARQ-ACK codebook length.
In specific implementation, after determining the length of the HARQ-ACK codebook, the UE may generate a corresponding HARQ-ACK codebook according to the length, and feed back HARQ-ACK information to the base station. When the UE receives the DCI, if the DCI is the scheduling DCI, feeding back ACK information when the DCI is subjected to TB de-pairing, and otherwise feeding back NACK information. And if the DCI indicates that the semi-persistent scheduling SPS is deactivated, the UE feeds back ACK information when receiving the DCI, otherwise, the UE feeds back NACK information.
In 5G NR, the base station uses the physical downlink control channel listening time as a DAI count time, thereby reducing the number of DCI existing at the same time at each DAI count time.
In the invention, when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the base station takes the initial position of each time slot of the physical downlink control channel monitoring time as the DAI counting time, and when the physical downlink control channel monitoring time is not located in the first three OFDM symbols of the time slot, the base station takes the initial position of the physical downlink control channel monitoring time as the DAI counting time. Counting the number of DCI sent to the service cell by the base station in the physical downlink control channel monitoring time set, and configuring the values of the counting DAI and the total DAI in the DAI field of the DCI. Therefore, in the same time slot, the DCI monitored at each physical downlink control channel monitoring time is counted at the same time, so that the number of DCI simultaneously existing at each DAI counting time is increased, and the condition that the UE fails to detect the DCI is reduced.
In order to make it clear for those skilled in the art to implement the embodiment of the present invention, how the base station configures the value of the count DAI and the value of the total DAI is described in detail as follows:
in an embodiment of the present invention, the total DAI is: and the total amount of DCI sent by the base station in all cells from the first DAI counting time to the current DAI counting time in the physical downlink control channel monitoring time set.
In an embodiment of the present invention, the counting DAI is: and in the physical downlink control channel monitoring time set, the base station sends the cumulative count of DCI times from the first cell to the current cell at the current DAI counting time and the sum of the total DAI corresponding to the previous DAI counting time.
Taking the corresponding relationship between the monitoring time of the PDCCH and the cell in fig. 1 as an example, if the base station only sends DCI in the time slot n-1, for the time slot n-1, since the monitoring time of the PDCCH is located in the first 3 OFDM symbols, the DAI counting time is the starting position of the time slot n-1, and there is only one counting time. The count DAI (i.e., C-DAI) read by the UE in the DCI is 1, 2, and 3, respectively, and at time 1, for 3 serving cells, the total count of the DCI times transmitted by the base station is 3, that is, the total DAI (i.e., T-DAI) is 3, as shown in table 3:
TABLE 3
Comparing table 1 with table 3, if the UE does not solve the DCI on cell 2, the UE will receive the total DAI at the last DAI count time to determine the HARQ-ACK codebook length. In table 1, according to the scheme in 5G NR, the total DAI received at the last DAI count time is 2. In table 3, the total DAI received at the last DAI count time is 3, according to the scheme of the present invention. Because the number of DCI actually sent by the base station in the time slot n-1 is 3, the total DAI obtained by applying the scheme of the invention is more accurate.
For another example, referring to fig. 3, the monitoring time of the pdcch of cell 0 is OFDM symbol 1 of each timeslot, and SCS is 15 kHz; the monitoring time of the physical downlink control channel of the cell 1 is an OFDM symbol 2 of each time slot, and SCS is 15 kHz; the monitoring time of the physical downlink control channel of the cell 2 is OFDM symbol 0 of each time slot, and SCS is 30 kHz; the monitoring time of the physical downlink control channel of the cell 3 is the OFDM symbol 1 of each time slot, and the SCS is 30 kHz. The PDCCH monitoring time is located in the first three OFDM symbols of each time slot. The counting time of the DAI is the starting position of the corresponding time slot.
For 15KHz SCS, assume that the base station configures the UE to feed back HARQ-ACK information in slot n. For 30KHz SCS, assume that the base station configures the UE to feed back HARQ-ACK information in slot 2 n.
If the base station is in slot n-2(15kHz SCS), only DCI for scheduling data of serving cells 0 and 1 is transmitted to the UE. The base station transmits only DCI for scheduling data of the serving cells 2 and 3 to the UE at the time slot 2n-4 (SCS of 30 KHz). The base station transmits DCI for scheduling data of the serving cells 2 and 3 to the UE at a slot 2n-3 (SCS of 30 KHz). One slot length of the 15kHz SCS corresponds to two slot lengths of the 30kHz SCS, i.e., slot n-2(15kHz SCS) corresponds to slot 2n-4(30kHz SCS) plus slot 2n-3(30kHz SCS).
Since the slot n-2 of the 15kHz SCS corresponds in time domain to the slots 2n-4 and 2n-3 of the 30kHz SCS, there are 2 DAI count times, respectively the start t1 of the slot 2n-4 of the 30kHz SCS and the start t2 of the slot 2n-3 of the 30kHz SCS, in accordance with the inventive arrangements.
At DAI count times T1, T2, the values of the count DAI (i.e., C-DAI) and the total DAI (i.e., T-DAI) are shown in Table 4:
TABLE 4
In table 4, the values of the count DAI and the total DAI are the values of the actual count DAI and the total DAI, respectively, in order to describe the changes of the count DAI and the total DAI more clearly. The actual count DAI is determined based on the number of times the DCI has been actually received, and the count DAI read from the DCI. The actual total DAI value is determined based on the number of times the DCI has been actually received, and the total DAI value read from the DCI.
As can be seen from the above, by applying the feedback method of HARQ-ACK information according to the embodiment of the present invention, DCI scheduled at different pdcch monitoring times can be counted at the same counting time, so that the number of DCI existing at the same time at any DAI counting time is increased, thereby reducing the occurrence of the situation that only one DCI exists at the last DAI counting time, effectively avoiding missing DCI detection, and improving the accuracy of the determined HARQ-ACK codebook length.
In order to make the present invention better understood and realized by those skilled in the art, the following detailed description is provided for a device and a computer readable storage medium corresponding to the above method.
Referring to fig. 4, an embodiment of the present invention provides a user terminal 40, where the user terminal 40 may include: reading section 41, codebook length determining section 42, and feedback section 43. Wherein:
the reading unit 41 is adapted to, for a time slot for feeding back HARQ-ACK information configured in advance, read values of a count DAI and a total DAI from a downlink assignment index DAI field of DCI when DCI is received in a monitoring time set of a physical downlink control channel associated with a HARQ feedback window corresponding to the time slot for sending HARQ-ACK information;
the codebook length determining unit 42 is adapted to determine the HARQ-ACK codebook length based on the total DAI value corresponding to the last DAI counting time in the set of the physical downlink control channel monitoring times;
the feedback unit 43 is adapted to feed back HARQ-ACK information corresponding to the monitoring time set of the physical downlink control channel to the base station based on the determined HARQ-ACK codebook length.
When the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time;
and when the monitoring time of the physical downlink control channel is not located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time.
In an embodiment of the invention, the total DAI is: and the total amount of DCI sent by the base station in all cells from the first DAI counting time to the current DAI counting time in the physical downlink control channel monitoring time set.
In an embodiment of the invention, the count DAI is: and in the physical downlink control channel monitoring time set, the base station sends the cumulative count of DCI times from the first cell to the current cell at the current DAI counting time and the sum of the total DAI corresponding to the previous DAI counting time.
In an embodiment of the present invention, the codebook length determining unit 42 may include: a first determining subunit 421 and a second determining subunit 422. Wherein:
the first determining subunit 421 is adapted to determine, based on the number of times that the DCI has been actually received and a value of a total DAI read from the DCI at the last DAI counting time, a value of an actual total DAI corresponding to the last DAI counting time;
the second determining subunit 422 is adapted to determine the HARQ-ACK codebook length based on the actual total DAI value corresponding to the last DAI counting time.
In an embodiment of the present invention, the user terminal 40 may further include: and a judging unit (not shown) adapted to judge whether to miss DCI based on the values of the actual count DAI and the total DAI.
In a specific implementation, the HARQ feedback window is determined by a set of HARQ-ACK feedback times.
In a specific implementation, the set of monitoring time of the physical downlink control channel is as follows: and the time slot in the HARQ feedback window receives a set of physical downlink control channel monitoring time corresponding to the PDSCH data.
The embodiment of the present invention further provides another computer-readable storage medium, where a computer instruction is stored, and when the computer instruction runs, the step of performing any one of the HARQ-ACK information feedback methods in the foregoing embodiments is executed, which is not described again.
In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The embodiment of the present invention further provides a user terminal, where the user terminal may include a memory and a processor, where the memory stores a computer instruction capable of being executed on the processor, and the processor executes, when executing the computer instruction, any step of the feedback method for HARQ-ACK information in the above embodiments, which is not described again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (16)
1. A method for feeding back HARQ-ACK information is characterized by comprising the following steps:
for a time slot for feeding back HARQ-ACK information configured in advance, in a physical downlink control channel monitoring time set associated with a HARQ feedback window corresponding to the time slot for sending the HARQ-ACK information, when DCI is received, reading values of a counting DAI and a total DAI from a downlink assignment index DAI field of the DCI;
determining the length of an HARQ-ACK codebook based on the value of the total DAI corresponding to the last DAI counting time in the physical downlink control channel monitoring time set;
feeding back HARQ-ACK information corresponding to the physical downlink control channel monitoring time set to a base station based on the determined HARQ-ACK codebook length;
when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time;
and when the monitoring time of the physical downlink control channel is not located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time.
2. The feedback method of HARQ-ACK information of claim 1, wherein the total DAI is: and the total amount of DCI sent by the base station in all cells from the first DAI counting time to the current DAI counting time in the physical downlink control channel monitoring time set.
3. The feedback method of HARQ-ACK information of claim 1, wherein the counting DAI is: and in the physical downlink control channel monitoring time set, the base station sends the cumulative count of DCI times from the first cell to the current cell at the current DAI counting time and the sum of the total DAI corresponding to the previous DAI counting time.
4. The method for feeding back HARQ-ACK information of claim 1, wherein the determining the HARQ-ACK codebook length based on the total DAI value corresponding to the last DAI counting time in the pdcch listening time set comprises:
determining the actual total DAI value corresponding to the last DAI counting moment based on the number of times that the DCI is actually received and the total DAI value read from the DCI at the last DAI counting moment;
and determining the length of the HARQ-ACK codebook based on the value of the actual total DAI corresponding to the last DAI counting moment.
5. The feedback method of HARQ-ACK information of claim 4, further comprising:
and judging whether the DCI is missed to be detected or not based on the actual counting DAI and the total DAI value.
6. The method for feeding back HARQ-ACK information of claim 1, wherein the HARQ feedback window is determined by a set of HARQ-ACK feedback times.
7. The method for feeding back HARQ-ACK information of claim 1, wherein the set of the listening time of the physical downlink control channel is: and the time slot in the HARQ feedback window receives a set of physical downlink control channel monitoring time corresponding to the PDSCH data.
8. A user terminal, comprising:
a reading unit, adapted to, for a pre-configured time slot for feeding back HARQ-ACK information, read, when receiving DCI, values of a count DAI and a total DAI from a downlink assignment index DAI field of the DCI in a monitoring time set of a physical downlink control channel associated with a HARQ feedback window corresponding to the time slot for sending the HARQ-ACK information;
a codebook length determining unit, adapted to determine the HARQ-ACK codebook length based on the value of the total DAI corresponding to the last DAI counting time in the set of physical downlink control channel monitoring times;
a feedback unit, adapted to feed back HARQ-ACK information corresponding to the physical downlink control channel monitoring time set to a base station based on the determined HARQ-ACK codebook length;
when the physical downlink control channel monitoring time is located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of each time slot where the physical downlink control channel monitoring time is located as the DAI counting time;
and when the monitoring time of the physical downlink control channel is not located in the first three OFDM symbols of the time slot, the counting DAI and the total DAI value are obtained by counting the DCI sending times of the base station by taking the initial position of the monitoring time of the physical downlink control channel as the DAI counting time.
9. The user terminal of claim 8, wherein the total DAI is: and the total amount of DCI sent by the base station in all cells from the first DAI counting time to the current DAI counting time in the physical downlink control channel monitoring time set.
10. The user terminal of claim 8, wherein the counting DAI is: and in the physical downlink control channel monitoring time set, the base station sends the cumulative count of DCI times from the first cell to the current cell at the current DAI counting time and the sum of the total DAI corresponding to the previous DAI counting time.
11. The user terminal of claim 8, wherein the codebook length determining unit comprises:
the first determining subunit is suitable for determining an actual total DAI value corresponding to the last DAI counting moment based on the number of times that the DCI is actually received and the total DAI value read from the DCI at the last DAI counting moment;
and the second determining subunit is suitable for determining the length of the HARQ-ACK codebook based on the value of the actual total DAI corresponding to the last DAI counting moment.
12. The user terminal of claim 11, further comprising: and the judging unit is suitable for judging whether the DCI is missed to be detected or not based on the actual counting DAI and the total DAI.
13. The user terminal of claim 8, wherein the HARQ feedback window is determined by a set of HARQ-ACK feedback times.
14. The ue of claim 8, wherein the set of pdcch listening instants is: and the time slot in the HARQ feedback window receives a set of physical downlink control channel monitoring time corresponding to the PDSCH data.
15. A computer readable storage medium having computer instructions stored thereon, wherein the computer instructions when executed perform the steps of the method of any one of claims 1 to 7.
16. A user terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 7.
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